Lifting-jack



PatientedJun-e 411, 1895.

LIFTING J ACK.

J. C. FORAKER.

IIIII (No Moel.)

:TzRs co.. pHoro-wma., wAsHmmoN D c NITED STATES JOHN O. FORAKER, OFBAXTER SPRINGS, KANSAS.

LlFTlNG-JACK.

VSPEGIFICACLIION forming part of Letters Patent No. 541,043, dated June11, 1895. Application filed July 30, 18.94. Serial No. 519,039. (Nomodel.)

ject of the invention is to produce a lifting jack which is easilyOperated, and which is simple, strong, durable, and inexpensive ofwhichconstruction.

With this Object in view the invention consists in certain peculiar andnovel features of construction and combinations of parts, as will behereinafter described and claimed.

In order that the invention may be fully understood, I will proceed todescribe itwith reference to the accompanying drawings, in

Figure l is a view partly in side elevation and partly in section. Fig.2 is a vertical sectional view taken on the line 2 2 of Fig. 1, and Fig.3 is an edge view of the lifting-tackle.

In the said drawings, l and 2 designate standards, which are connectedat their upper ends by the cross-bealn 3. These standards, if placed ondamp or soft ground, will preferably be provided with blocks 5, 5, so asto provide an extended foot portion or base to prevent them sinking inthe ground. Vhen the device is placed upon hard ground,`thesefoot-portions are not necessary and may be removed. The standard 2,about midway its length, is provided with the verticalslot 6,

and journaled horizontally in bearings carried by said standards,adjacent to or at the upper end of said slot, is a shaft 7, upon whichis mounted rigidly the winding-drum 8. Journaled also in said standard,and extending transversely of the slot 6, near its lower end, is theshaft 9, and mounted rigidly upon said shaft, is the grooved pulley Y10.

The cross-beam 3 is provided with a slot 1l, extending verticallytherethrough, and mounted rotatably in said slot is the grooved pulleyl2. Mounted upon said cross-beam and at the end of said beam above thestandard 2, and upon opposite sidesot the slot l1, are the Y ively.

bearing-boxes 13, and journaled rotatably in said bearing-boxes andtransversely of said slot, is the grooved pulley lat. A bolt l5 extendstransversely of an Opening formed in the cross-beam, and secured rigidlyupon said bolt by splicing or in any other suitable manner, is the upperend of a rope or 'cable 16. A lifting block comprises thev vertical andparallel plates 17, and interposed between and secured to said plates,is the block 1S. A grooved pulley 19 is mounted rotatably be tween theupper ends of said plates 17, and this lifting block is placedoperatively relative to the rope or cable by passing the free end ofsaid rope or cable around the pulley` 19, th'en vertically upward andforward and over the grooved pulleys 12 and 14, respectthrough thegroove .or opening 20, formed vertically in the upper end ot' thestandard 2, and isbrought around the grooved pulley 10, thence extendsupwardly and around the winding-drum 8, to which it is permanently andfirmly secured at its end, as shown at 2l.

Mounted rigidly upon the shaft 7, at the outer side of the standard 2,is a ratchet-wheel 22, and mounted pivotally upon the bolt or pin 23carried by said standard and above said ratchet`wheel, is a gravity-dog24, which engages the ratchet-wheel 22, and is adapted to yield andallow said ratchet-wheel to rotate in one direction, and to prevent therotation ofthe same in theopposite direction. A lever 25 is loosely orrotatably mounted upon the shaft 7, at the outer side of theratchet-wheel 22, and is held from accidental displacement by the washerand retaining nut 26. This lever is preferably formed with a handleportion 27, or may be provided with an outwardly projecting handle 28,so .as to constitute a crank.

A pawl 29 is provided with a longitudinal slot 30, and said slot slidingengages the pins or bolts 3l, projecting inwardly from the lever 25, andiS of sufficient length to allow the pawl to be moved into or out ofengagement with the teeth of the ratchet-wheel, and to accomplish` theautomatic disengagement of said pawl from the ratchet-wheel, it isprovided .with a beveled lower end 29a, which coming in contact with thebeveled or inclined por- The cable is then drawn downwardly IOO tion ofthe teeth of the ratchet as the leveris moved rearwardly, rides u p overthe same, as will be understood.

'lhe plates 17 of the lifting-block are connected at their lower ends bya bolt or pin 32, and pivotally carried by said bolt are oppo sitelydisposed grabhooks 33, and the short ordinary hook 34.

In lifting a log or other heavy object, the lifting-block is lowereduntil the grab-hooks can be engaged upon opposite sides of the log orother object, as shown clearly in Fig. 1. 'lhe lever is now grasped androtated in the direction indicated by the arrow, Fig. 2, and by reasonof the engaging pawl 29 and the ratchet-wheel 22, the shaft 7 isrotated, and this rotation ot' the shaft winds the rope or cable uponthe drum S, and raises or elevates tho log or other object from theground. As the lever is thrown back to its original position, thebeveled surface 29 of the pawl, en-

gaging the successively presented teeth of the ratchetavheel, causessaid pawl to slide up-l ward upon the guide-bolts 31, to allow this backward movement ofthe leverto take place, and while this operation is inprogress the gravity-dog 24, engaging the ratchet-wheel at its oppositeside, prevents its back rotation and the consequent lowering of the logor other object. The operation of the lever as described is repeateduntil the log or other object is raised to the required height. Itnecessary to deposit the log or other object in a plane slightly lowerthan the one to which it has been raised, the dog 24 is disengaged fromthe ratchetwheel, and the lever is grasped to lower the log or otherobject slowly.

It will be apparent from the foregoing that heavy objects may be handledwith this jack easily and expeditiously, because it takes only half thepower to raise the weight by the arrangement of the pulleys and thedoubling of the rope or cable at its point ot' connection with thegrooved pulley 19, that would be required to raise the weight by adirect pull. 1t will also be apparent by this arrangement that as theweight is equally distributed between two portions of the rope or cable,it is necessary to use a rope or cable of only half the diameter that;would be required in raising the weight where it would be applieddirectly upon one portion of the cable.

When objects to be elevated are of such forni that they cannot beconveniently engaged by the grab-hooks, the ordinary hook 3l: may beemployed in lieu thereof.

From the above description it will be apparent that I have produced alifting jack which will be of great service in elevating heavy logs,balng-presses, and other heavy bodies, a'nd also lighter objects ifdesired, and which is simple, strong, durable, and inex pensive ofconstruction and easily operated.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is y 1. In a littingjack, the combination witha suitable framework, a rope, and a shaft havinga drum upon which thelifting rope is wound or unwouud, and a ratchet-wheel, of a lever,provided with headed guide-pins, and a sliding gravity-pawl having abeveled lower end and provided with a slot engaging said guide-pins,substantially as described.

2. In a lifting-jack, the combination with a' pair ot verticalstandards, one ot them slotted, a cross-beam connecting the upper endsof the same and provided with a longitudinal slot and a pin,guide-pulleys jourhaled upon said beam and in the vertical plane of itsslot, a guide-pulley journaled in the lower end of the slot of thestandard, a winding drum 1ocated in the upper end of the said slot, acable secured at its opposite ends to said winding drum and said pin,and guided around said guidepulleys and through said slots, and alifting-tackle comprising a body-portion, pendent hooks, and a groovedpulley mounted upon the said cable, with a ratchet-wheel mounted uponthe shaft ofthe winding-drum, a lever, a pawl carried by said lever, anda dog supported from the frame-work, substantially as set forth.

In testimony whereof I atlix my signature in presence of two witnesses.

JOHN C. FORAKER. Witnesses:

M. R. REMLEY, G. Y. THORPE.

